...spend a lot of money on something and decide you should go into business making it?

This happens to me somewhat often. The first time, I think, was in undergrad when my car got towed because I had forgotten to properly display my parking permit. As I was shelling out the $200 or whatever to get my car out, I realized that the towing business must be all profit. I decided I should open a towing business.

Flash forward to today. I found out that replace 2 screws on the casing for my air filter in my car, I would have to buy a $250 part since the screws can't be bought individually ( a fact that I am going to look into). This is not the point. The point is that a plastic casing which couldn't cost more than, let's be generous, $10 to make is costing me $250. That's 2500% markup! I now realize that although the towing business is a decent idea, making these plastic casings for cars is basically like having a license to print your own money! (what if you went into the "licenses to print your own money" printing business? That'd be pretty good too I suppose. )

On an unrelated note, I just made a paper airplane out of a sheet of notebook paper. Anyone want to give me $75 for it?